Calculator of Phase Matching for SHG

1.BBO (β-Barium Borate) crystal refractive index equation ($\lambda$ unit is $\mu$m):
$$ n^2_o = 2.7359+\frac{0.01878}{\lambda^2-0.01822}-0.01354\lambda^2$$ $$ n^2_e = 2.3753+\frac{0.01224}{\lambda^2-0.01667}-0.01516\lambda^2$$

2.KDP crystal refractive index equation ($\lambda$ unit is $\mu$m):
$$ n^2_o = 2.259276+\frac{0.01008956}{\lambda^2-0.012942625}+\frac{13.00522\lambda^2}{\lambda^2-400}$$ $$ n^2_e = 2.132668+\frac{0.008637494}{\lambda^2-0.012281043}+\frac{3.2279924\lambda^2}{\lambda^2-400}$$

3.KBBF crystal refractive index equation ($\lambda$ unit is $\mu$m):
$$ n^2_o = 1+\frac{1.1713\lambda^2}{\lambda^2-0.00733}-0.01022\lambda^2$$ $$ n^2_e = 1+\frac{0.9316\lambda^2}{\lambda^2-0.00675}-0.00169\lambda^2$$

4.LBO crystal refractive index equation ($\lambda$ unit is $\mu$m):
$$ n^2_x = 2.454140+\frac{0.011249}{\lambda^2-0.011350}-0.014591\lambda^2-6.60\times10^{-5}\lambda^4$$ $$ n^2_y = 2.539070+\frac{0.012711}{\lambda^2-0.012523}-0.018540\lambda^2+2.00\times10^{-4}\lambda^4$$ $$ n^2_z = 2.586179+\frac{0.013099}{\lambda^2-0.011893}-0.017968\lambda^2-2.26\times10^{-4}\lambda^4$$

5.BIBO crystal refractive index equation ($\lambda$ unit is $\mu$m):
$$ n^2_x = 3.65454+\frac{0.05112}{\lambda^2-0.03713}-0.02261\lambda^2$$ $$ n^2_y = 3.07403+\frac{0.03231}{\lambda^2-0.03163}-0.013376\lambda^2$$ $$ n^2_z = 3.16853+\frac{0.03731}{\lambda^2-0.03463}-0.017508\lambda^2$$